From Wikipedia, the free encyclopedia

Drug abuse prevention and drug use prevention is a process that
attempts to prevent the onset of substance use or limit the
development of problems associated with using psychoactive
substances. Prevention efforts may focus on the individual or their
surroundings. A concept known as "environmental prevention" focuses
on changing community conditions or policies so that the
availability of substances is reduced as well as the demand.

Of these, substance abuse prevention typically focuses on
alcohol, tobacco, and marijuana based on gateway
drug theory which proposes that these three substances are
typically used first and may ultimately lead to the use of "hard
drugs" like cocaine or heroin.